This book constitutes revised selected papers from the First International Conference on Information Systems Security and Privacy, ICISSP 2015, held in Angers, France, in February 2015. The 12 papers presented in this volume were carefully reviewed and selection from a total of 56 submissions. They were organized in topical sections named: data and software security; privacy and confidentiality; mobile systems security; and biometric authentication. The book also contains two invited papers. .